sas_scsi_host.c 27 KB

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  1. /*
  2. * Serial Attached SCSI (SAS) class SCSI Host glue.
  3. *
  4. * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
  5. * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
  6. *
  7. * This file is licensed under GPLv2.
  8. *
  9. * This program is free software; you can redistribute it and/or
  10. * modify it under the terms of the GNU General Public License as
  11. * published by the Free Software Foundation; either version 2 of the
  12. * License, or (at your option) any later version.
  13. *
  14. * This program is distributed in the hope that it will be useful, but
  15. * WITHOUT ANY WARRANTY; without even the implied warranty of
  16. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17. * General Public License for more details.
  18. *
  19. * You should have received a copy of the GNU General Public License
  20. * along with this program; if not, write to the Free Software
  21. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22. * USA
  23. *
  24. */
  25. #include <linux/kthread.h>
  26. #include <linux/firmware.h>
  27. #include <linux/export.h>
  28. #include <linux/ctype.h>
  29. #include "sas_internal.h"
  30. #include <scsi/scsi_host.h>
  31. #include <scsi/scsi_device.h>
  32. #include <scsi/scsi_tcq.h>
  33. #include <scsi/scsi.h>
  34. #include <scsi/scsi_eh.h>
  35. #include <scsi/scsi_transport.h>
  36. #include <scsi/scsi_transport_sas.h>
  37. #include <scsi/sas_ata.h>
  38. #include "../scsi_sas_internal.h"
  39. #include "../scsi_transport_api.h"
  40. #include "../scsi_priv.h"
  41. #include <linux/err.h>
  42. #include <linux/blkdev.h>
  43. #include <linux/freezer.h>
  44. #include <linux/gfp.h>
  45. #include <linux/scatterlist.h>
  46. #include <linux/libata.h>
  47. /* record final status and free the task */
  48. static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
  49. {
  50. struct task_status_struct *ts = &task->task_status;
  51. int hs = 0, stat = 0;
  52. if (ts->resp == SAS_TASK_UNDELIVERED) {
  53. /* transport error */
  54. hs = DID_NO_CONNECT;
  55. } else { /* ts->resp == SAS_TASK_COMPLETE */
  56. /* task delivered, what happened afterwards? */
  57. switch (ts->stat) {
  58. case SAS_DEV_NO_RESPONSE:
  59. case SAS_INTERRUPTED:
  60. case SAS_PHY_DOWN:
  61. case SAS_NAK_R_ERR:
  62. case SAS_OPEN_TO:
  63. hs = DID_NO_CONNECT;
  64. break;
  65. case SAS_DATA_UNDERRUN:
  66. scsi_set_resid(sc, ts->residual);
  67. if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
  68. hs = DID_ERROR;
  69. break;
  70. case SAS_DATA_OVERRUN:
  71. hs = DID_ERROR;
  72. break;
  73. case SAS_QUEUE_FULL:
  74. hs = DID_SOFT_ERROR; /* retry */
  75. break;
  76. case SAS_DEVICE_UNKNOWN:
  77. hs = DID_BAD_TARGET;
  78. break;
  79. case SAS_SG_ERR:
  80. hs = DID_PARITY;
  81. break;
  82. case SAS_OPEN_REJECT:
  83. if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
  84. hs = DID_SOFT_ERROR; /* retry */
  85. else
  86. hs = DID_ERROR;
  87. break;
  88. case SAS_PROTO_RESPONSE:
  89. SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
  90. "task; please report this\n",
  91. task->dev->port->ha->sas_ha_name);
  92. break;
  93. case SAS_ABORTED_TASK:
  94. hs = DID_ABORT;
  95. break;
  96. case SAM_STAT_CHECK_CONDITION:
  97. memcpy(sc->sense_buffer, ts->buf,
  98. min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
  99. stat = SAM_STAT_CHECK_CONDITION;
  100. break;
  101. default:
  102. stat = ts->stat;
  103. break;
  104. }
  105. }
  106. sc->result = (hs << 16) | stat;
  107. ASSIGN_SAS_TASK(sc, NULL);
  108. list_del_init(&task->list);
  109. sas_free_task(task);
  110. }
  111. static void sas_scsi_task_done(struct sas_task *task)
  112. {
  113. struct scsi_cmnd *sc = task->uldd_task;
  114. struct domain_device *dev = task->dev;
  115. struct sas_ha_struct *ha = dev->port->ha;
  116. unsigned long flags;
  117. spin_lock_irqsave(&dev->done_lock, flags);
  118. if (test_bit(SAS_HA_FROZEN, &ha->state))
  119. task = NULL;
  120. else
  121. ASSIGN_SAS_TASK(sc, NULL);
  122. spin_unlock_irqrestore(&dev->done_lock, flags);
  123. if (unlikely(!task)) {
  124. /* task will be completed by the error handler */
  125. SAS_DPRINTK("task done but aborted\n");
  126. return;
  127. }
  128. if (unlikely(!sc)) {
  129. SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
  130. list_del_init(&task->list);
  131. sas_free_task(task);
  132. return;
  133. }
  134. sas_end_task(sc, task);
  135. sc->scsi_done(sc);
  136. }
  137. static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
  138. struct domain_device *dev,
  139. gfp_t gfp_flags)
  140. {
  141. struct sas_task *task = sas_alloc_task(gfp_flags);
  142. struct scsi_lun lun;
  143. if (!task)
  144. return NULL;
  145. task->uldd_task = cmd;
  146. ASSIGN_SAS_TASK(cmd, task);
  147. task->dev = dev;
  148. task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
  149. task->ssp_task.retry_count = 1;
  150. int_to_scsilun(cmd->device->lun, &lun);
  151. memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
  152. task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
  153. memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
  154. task->scatter = scsi_sglist(cmd);
  155. task->num_scatter = scsi_sg_count(cmd);
  156. task->total_xfer_len = scsi_bufflen(cmd);
  157. task->data_dir = cmd->sc_data_direction;
  158. task->task_done = sas_scsi_task_done;
  159. return task;
  160. }
  161. int sas_queue_up(struct sas_task *task)
  162. {
  163. struct sas_ha_struct *sas_ha = task->dev->port->ha;
  164. struct scsi_core *core = &sas_ha->core;
  165. unsigned long flags;
  166. LIST_HEAD(list);
  167. spin_lock_irqsave(&core->task_queue_lock, flags);
  168. if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
  169. spin_unlock_irqrestore(&core->task_queue_lock, flags);
  170. return -SAS_QUEUE_FULL;
  171. }
  172. list_add_tail(&task->list, &core->task_queue);
  173. core->task_queue_size += 1;
  174. spin_unlock_irqrestore(&core->task_queue_lock, flags);
  175. wake_up_process(core->queue_thread);
  176. return 0;
  177. }
  178. int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
  179. {
  180. struct sas_internal *i = to_sas_internal(host->transportt);
  181. struct domain_device *dev = cmd_to_domain_dev(cmd);
  182. struct sas_ha_struct *sas_ha = dev->port->ha;
  183. struct sas_task *task;
  184. int res = 0;
  185. /* If the device fell off, no sense in issuing commands */
  186. if (test_bit(SAS_DEV_GONE, &dev->state)) {
  187. cmd->result = DID_BAD_TARGET << 16;
  188. goto out_done;
  189. }
  190. if (dev_is_sata(dev)) {
  191. spin_lock_irq(dev->sata_dev.ap->lock);
  192. res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
  193. spin_unlock_irq(dev->sata_dev.ap->lock);
  194. return res;
  195. }
  196. task = sas_create_task(cmd, dev, GFP_ATOMIC);
  197. if (!task)
  198. return SCSI_MLQUEUE_HOST_BUSY;
  199. /* Queue up, Direct Mode or Task Collector Mode. */
  200. if (sas_ha->lldd_max_execute_num < 2)
  201. res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
  202. else
  203. res = sas_queue_up(task);
  204. if (res)
  205. goto out_free_task;
  206. return 0;
  207. out_free_task:
  208. SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
  209. ASSIGN_SAS_TASK(cmd, NULL);
  210. sas_free_task(task);
  211. if (res == -SAS_QUEUE_FULL)
  212. cmd->result = DID_SOFT_ERROR << 16; /* retry */
  213. else
  214. cmd->result = DID_ERROR << 16;
  215. out_done:
  216. cmd->scsi_done(cmd);
  217. return 0;
  218. }
  219. static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
  220. {
  221. struct sas_task *task = TO_SAS_TASK(cmd);
  222. struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
  223. /* At this point, we only get called following an actual abort
  224. * of the task, so we should be guaranteed not to be racing with
  225. * any completions from the LLD. Task is freed after this.
  226. */
  227. sas_end_task(cmd, task);
  228. /* now finish the command and move it on to the error
  229. * handler done list, this also takes it off the
  230. * error handler pending list.
  231. */
  232. scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
  233. }
  234. static void sas_eh_defer_cmd(struct scsi_cmnd *cmd)
  235. {
  236. struct sas_task *task = TO_SAS_TASK(cmd);
  237. struct domain_device *dev = task->dev;
  238. struct sas_ha_struct *ha = dev->port->ha;
  239. if (!dev_is_sata(dev)) {
  240. sas_eh_finish_cmd(cmd);
  241. return;
  242. }
  243. /* report the timeout to libata */
  244. sas_end_task(cmd, task);
  245. list_move_tail(&cmd->eh_entry, &ha->eh_ata_q);
  246. }
  247. static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
  248. {
  249. struct scsi_cmnd *cmd, *n;
  250. list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
  251. if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
  252. cmd->device->lun == my_cmd->device->lun)
  253. sas_eh_defer_cmd(cmd);
  254. }
  255. }
  256. static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
  257. struct domain_device *dev)
  258. {
  259. struct scsi_cmnd *cmd, *n;
  260. list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
  261. struct domain_device *x = cmd_to_domain_dev(cmd);
  262. if (x == dev)
  263. sas_eh_finish_cmd(cmd);
  264. }
  265. }
  266. static void sas_scsi_clear_queue_port(struct list_head *error_q,
  267. struct asd_sas_port *port)
  268. {
  269. struct scsi_cmnd *cmd, *n;
  270. list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
  271. struct domain_device *dev = cmd_to_domain_dev(cmd);
  272. struct asd_sas_port *x = dev->port;
  273. if (x == port)
  274. sas_eh_finish_cmd(cmd);
  275. }
  276. }
  277. enum task_disposition {
  278. TASK_IS_DONE,
  279. TASK_IS_ABORTED,
  280. TASK_IS_AT_LU,
  281. TASK_IS_NOT_AT_HA,
  282. TASK_IS_NOT_AT_LU,
  283. TASK_ABORT_FAILED,
  284. };
  285. static enum task_disposition sas_scsi_find_task(struct sas_task *task)
  286. {
  287. struct sas_ha_struct *ha = task->dev->port->ha;
  288. unsigned long flags;
  289. int i, res;
  290. struct sas_internal *si =
  291. to_sas_internal(task->dev->port->ha->core.shost->transportt);
  292. if (ha->lldd_max_execute_num > 1) {
  293. struct scsi_core *core = &ha->core;
  294. struct sas_task *t, *n;
  295. mutex_lock(&core->task_queue_flush);
  296. spin_lock_irqsave(&core->task_queue_lock, flags);
  297. list_for_each_entry_safe(t, n, &core->task_queue, list)
  298. if (task == t) {
  299. list_del_init(&t->list);
  300. break;
  301. }
  302. spin_unlock_irqrestore(&core->task_queue_lock, flags);
  303. mutex_unlock(&core->task_queue_flush);
  304. if (task == t)
  305. return TASK_IS_NOT_AT_HA;
  306. }
  307. for (i = 0; i < 5; i++) {
  308. SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
  309. res = si->dft->lldd_abort_task(task);
  310. spin_lock_irqsave(&task->task_state_lock, flags);
  311. if (task->task_state_flags & SAS_TASK_STATE_DONE) {
  312. spin_unlock_irqrestore(&task->task_state_lock, flags);
  313. SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
  314. task);
  315. return TASK_IS_DONE;
  316. }
  317. spin_unlock_irqrestore(&task->task_state_lock, flags);
  318. if (res == TMF_RESP_FUNC_COMPLETE) {
  319. SAS_DPRINTK("%s: task 0x%p is aborted\n",
  320. __func__, task);
  321. return TASK_IS_ABORTED;
  322. } else if (si->dft->lldd_query_task) {
  323. SAS_DPRINTK("%s: querying task 0x%p\n",
  324. __func__, task);
  325. res = si->dft->lldd_query_task(task);
  326. switch (res) {
  327. case TMF_RESP_FUNC_SUCC:
  328. SAS_DPRINTK("%s: task 0x%p at LU\n",
  329. __func__, task);
  330. return TASK_IS_AT_LU;
  331. case TMF_RESP_FUNC_COMPLETE:
  332. SAS_DPRINTK("%s: task 0x%p not at LU\n",
  333. __func__, task);
  334. return TASK_IS_NOT_AT_LU;
  335. case TMF_RESP_FUNC_FAILED:
  336. SAS_DPRINTK("%s: task 0x%p failed to abort\n",
  337. __func__, task);
  338. return TASK_ABORT_FAILED;
  339. }
  340. }
  341. }
  342. return res;
  343. }
  344. static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
  345. {
  346. int res = TMF_RESP_FUNC_FAILED;
  347. struct scsi_lun lun;
  348. struct sas_internal *i =
  349. to_sas_internal(dev->port->ha->core.shost->transportt);
  350. int_to_scsilun(cmd->device->lun, &lun);
  351. SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
  352. SAS_ADDR(dev->sas_addr),
  353. cmd->device->lun);
  354. if (i->dft->lldd_abort_task_set)
  355. res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
  356. if (res == TMF_RESP_FUNC_FAILED) {
  357. if (i->dft->lldd_clear_task_set)
  358. res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
  359. }
  360. if (res == TMF_RESP_FUNC_FAILED) {
  361. if (i->dft->lldd_lu_reset)
  362. res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
  363. }
  364. return res;
  365. }
  366. static int sas_recover_I_T(struct domain_device *dev)
  367. {
  368. int res = TMF_RESP_FUNC_FAILED;
  369. struct sas_internal *i =
  370. to_sas_internal(dev->port->ha->core.shost->transportt);
  371. SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
  372. SAS_ADDR(dev->sas_addr));
  373. if (i->dft->lldd_I_T_nexus_reset)
  374. res = i->dft->lldd_I_T_nexus_reset(dev);
  375. return res;
  376. }
  377. /* Find the sas_phy that's attached to this device */
  378. struct sas_phy *sas_find_local_phy(struct domain_device *dev)
  379. {
  380. struct domain_device *pdev = dev->parent;
  381. struct ex_phy *exphy = NULL;
  382. int i;
  383. /* Directly attached device */
  384. if (!pdev)
  385. return dev->port->phy;
  386. /* Otherwise look in the expander */
  387. for (i = 0; i < pdev->ex_dev.num_phys; i++)
  388. if (!memcmp(dev->sas_addr,
  389. pdev->ex_dev.ex_phy[i].attached_sas_addr,
  390. SAS_ADDR_SIZE)) {
  391. exphy = &pdev->ex_dev.ex_phy[i];
  392. break;
  393. }
  394. BUG_ON(!exphy);
  395. return exphy->phy;
  396. }
  397. EXPORT_SYMBOL_GPL(sas_find_local_phy);
  398. /* Attempt to send a LUN reset message to a device */
  399. int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
  400. {
  401. struct domain_device *dev = cmd_to_domain_dev(cmd);
  402. struct sas_internal *i =
  403. to_sas_internal(dev->port->ha->core.shost->transportt);
  404. struct scsi_lun lun;
  405. int res;
  406. int_to_scsilun(cmd->device->lun, &lun);
  407. if (!i->dft->lldd_lu_reset)
  408. return FAILED;
  409. res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
  410. if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
  411. return SUCCESS;
  412. return FAILED;
  413. }
  414. /* Attempt to send a phy (bus) reset */
  415. int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
  416. {
  417. struct domain_device *dev = cmd_to_domain_dev(cmd);
  418. struct sas_phy *phy = sas_find_local_phy(dev);
  419. int res;
  420. res = sas_phy_reset(phy, 1);
  421. if (res)
  422. SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
  423. kobject_name(&phy->dev.kobj),
  424. res);
  425. if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
  426. return SUCCESS;
  427. return FAILED;
  428. }
  429. /* Try to reset a device */
  430. static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
  431. {
  432. int res;
  433. struct Scsi_Host *shost = cmd->device->host;
  434. if (!shost->hostt->eh_device_reset_handler)
  435. goto try_bus_reset;
  436. res = shost->hostt->eh_device_reset_handler(cmd);
  437. if (res == SUCCESS)
  438. return res;
  439. try_bus_reset:
  440. if (shost->hostt->eh_bus_reset_handler)
  441. return shost->hostt->eh_bus_reset_handler(cmd);
  442. return FAILED;
  443. }
  444. static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
  445. struct list_head *work_q)
  446. {
  447. struct scsi_cmnd *cmd, *n;
  448. enum task_disposition res = TASK_IS_DONE;
  449. int tmf_resp, need_reset;
  450. struct sas_internal *i = to_sas_internal(shost->transportt);
  451. unsigned long flags;
  452. struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
  453. Again:
  454. list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
  455. struct domain_device *dev = cmd_to_domain_dev(cmd);
  456. struct sas_task *task;
  457. spin_lock_irqsave(&dev->done_lock, flags);
  458. /* by this point the lldd has either observed
  459. * SAS_HA_FROZEN and is leaving the task alone, or has
  460. * won the race with eh and decided to complete it
  461. */
  462. task = TO_SAS_TASK(cmd);
  463. spin_unlock_irqrestore(&dev->done_lock, flags);
  464. if (!task)
  465. continue;
  466. list_del_init(&cmd->eh_entry);
  467. spin_lock_irqsave(&task->task_state_lock, flags);
  468. need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
  469. spin_unlock_irqrestore(&task->task_state_lock, flags);
  470. if (need_reset) {
  471. SAS_DPRINTK("%s: task 0x%p requests reset\n",
  472. __func__, task);
  473. goto reset;
  474. }
  475. SAS_DPRINTK("trying to find task 0x%p\n", task);
  476. res = sas_scsi_find_task(task);
  477. cmd->eh_eflags = 0;
  478. switch (res) {
  479. case TASK_IS_NOT_AT_HA:
  480. SAS_DPRINTK("%s: task 0x%p is not at ha: %s\n",
  481. __func__, task,
  482. cmd->retries ? "retry" : "aborted");
  483. if (cmd->retries)
  484. cmd->retries--;
  485. sas_eh_finish_cmd(cmd);
  486. continue;
  487. case TASK_IS_DONE:
  488. SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
  489. task);
  490. sas_eh_defer_cmd(cmd);
  491. continue;
  492. case TASK_IS_ABORTED:
  493. SAS_DPRINTK("%s: task 0x%p is aborted\n",
  494. __func__, task);
  495. sas_eh_defer_cmd(cmd);
  496. continue;
  497. case TASK_IS_AT_LU:
  498. SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
  499. reset:
  500. tmf_resp = sas_recover_lu(task->dev, cmd);
  501. if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
  502. SAS_DPRINTK("dev %016llx LU %x is "
  503. "recovered\n",
  504. SAS_ADDR(task->dev),
  505. cmd->device->lun);
  506. sas_eh_defer_cmd(cmd);
  507. sas_scsi_clear_queue_lu(work_q, cmd);
  508. goto Again;
  509. }
  510. /* fallthrough */
  511. case TASK_IS_NOT_AT_LU:
  512. case TASK_ABORT_FAILED:
  513. SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
  514. task);
  515. tmf_resp = sas_recover_I_T(task->dev);
  516. if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
  517. struct domain_device *dev = task->dev;
  518. SAS_DPRINTK("I_T %016llx recovered\n",
  519. SAS_ADDR(task->dev->sas_addr));
  520. sas_eh_finish_cmd(cmd);
  521. sas_scsi_clear_queue_I_T(work_q, dev);
  522. goto Again;
  523. }
  524. /* Hammer time :-) */
  525. try_to_reset_cmd_device(cmd);
  526. if (i->dft->lldd_clear_nexus_port) {
  527. struct asd_sas_port *port = task->dev->port;
  528. SAS_DPRINTK("clearing nexus for port:%d\n",
  529. port->id);
  530. res = i->dft->lldd_clear_nexus_port(port);
  531. if (res == TMF_RESP_FUNC_COMPLETE) {
  532. SAS_DPRINTK("clear nexus port:%d "
  533. "succeeded\n", port->id);
  534. sas_eh_finish_cmd(cmd);
  535. sas_scsi_clear_queue_port(work_q,
  536. port);
  537. goto Again;
  538. }
  539. }
  540. if (i->dft->lldd_clear_nexus_ha) {
  541. SAS_DPRINTK("clear nexus ha\n");
  542. res = i->dft->lldd_clear_nexus_ha(ha);
  543. if (res == TMF_RESP_FUNC_COMPLETE) {
  544. SAS_DPRINTK("clear nexus ha "
  545. "succeeded\n");
  546. sas_eh_finish_cmd(cmd);
  547. goto clear_q;
  548. }
  549. }
  550. /* If we are here -- this means that no amount
  551. * of effort could recover from errors. Quite
  552. * possibly the HA just disappeared.
  553. */
  554. SAS_DPRINTK("error from device %llx, LUN %x "
  555. "couldn't be recovered in any way\n",
  556. SAS_ADDR(task->dev->sas_addr),
  557. cmd->device->lun);
  558. sas_eh_finish_cmd(cmd);
  559. goto clear_q;
  560. }
  561. }
  562. list_splice_tail_init(&ha->eh_ata_q, work_q);
  563. return list_empty(work_q);
  564. clear_q:
  565. SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
  566. list_for_each_entry_safe(cmd, n, work_q, eh_entry)
  567. sas_eh_finish_cmd(cmd);
  568. list_splice_tail_init(&ha->eh_ata_q, work_q);
  569. return list_empty(work_q);
  570. }
  571. void sas_scsi_recover_host(struct Scsi_Host *shost)
  572. {
  573. struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
  574. unsigned long flags;
  575. LIST_HEAD(eh_work_q);
  576. spin_lock_irqsave(shost->host_lock, flags);
  577. list_splice_init(&shost->eh_cmd_q, &eh_work_q);
  578. shost->host_eh_scheduled = 0;
  579. spin_unlock_irqrestore(shost->host_lock, flags);
  580. SAS_DPRINTK("Enter %s\n", __func__);
  581. /*
  582. * Deal with commands that still have SAS tasks (i.e. they didn't
  583. * complete via the normal sas_task completion mechanism)
  584. */
  585. set_bit(SAS_HA_FROZEN, &ha->state);
  586. if (sas_eh_handle_sas_errors(shost, &eh_work_q))
  587. goto out;
  588. /*
  589. * Now deal with SCSI commands that completed ok but have a an error
  590. * code (and hopefully sense data) attached. This is roughly what
  591. * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
  592. * command we see here has no sas_task and is thus unknown to the HA.
  593. */
  594. if (!sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q))
  595. if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
  596. scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
  597. out:
  598. clear_bit(SAS_HA_FROZEN, &ha->state);
  599. if (ha->lldd_max_execute_num > 1)
  600. wake_up_process(ha->core.queue_thread);
  601. /* now link into libata eh --- if we have any ata devices */
  602. sas_ata_strategy_handler(shost);
  603. scsi_eh_flush_done_q(&ha->eh_done_q);
  604. SAS_DPRINTK("--- Exit %s\n", __func__);
  605. return;
  606. }
  607. enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
  608. {
  609. scmd_printk(KERN_DEBUG, cmd, "command %p timed out\n", cmd);
  610. return BLK_EH_NOT_HANDLED;
  611. }
  612. int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
  613. {
  614. struct domain_device *dev = sdev_to_domain_dev(sdev);
  615. if (dev_is_sata(dev))
  616. return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
  617. return -EINVAL;
  618. }
  619. struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
  620. {
  621. struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
  622. struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
  623. struct domain_device *found_dev = NULL;
  624. int i;
  625. unsigned long flags;
  626. spin_lock_irqsave(&ha->phy_port_lock, flags);
  627. for (i = 0; i < ha->num_phys; i++) {
  628. struct asd_sas_port *port = ha->sas_port[i];
  629. struct domain_device *dev;
  630. spin_lock(&port->dev_list_lock);
  631. list_for_each_entry(dev, &port->dev_list, dev_list_node) {
  632. if (rphy == dev->rphy) {
  633. found_dev = dev;
  634. spin_unlock(&port->dev_list_lock);
  635. goto found;
  636. }
  637. }
  638. spin_unlock(&port->dev_list_lock);
  639. }
  640. found:
  641. spin_unlock_irqrestore(&ha->phy_port_lock, flags);
  642. return found_dev;
  643. }
  644. int sas_target_alloc(struct scsi_target *starget)
  645. {
  646. struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
  647. struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
  648. int res;
  649. if (!found_dev)
  650. return -ENODEV;
  651. if (dev_is_sata(found_dev)) {
  652. res = sas_ata_init_host_and_port(found_dev, starget);
  653. if (res)
  654. return res;
  655. }
  656. kref_get(&found_dev->kref);
  657. starget->hostdata = found_dev;
  658. return 0;
  659. }
  660. #define SAS_DEF_QD 256
  661. int sas_slave_configure(struct scsi_device *scsi_dev)
  662. {
  663. struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
  664. struct sas_ha_struct *sas_ha;
  665. BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
  666. if (dev_is_sata(dev)) {
  667. ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
  668. return 0;
  669. }
  670. sas_ha = dev->port->ha;
  671. sas_read_port_mode_page(scsi_dev);
  672. if (scsi_dev->tagged_supported) {
  673. scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
  674. scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
  675. } else {
  676. SAS_DPRINTK("device %llx, LUN %x doesn't support "
  677. "TCQ\n", SAS_ADDR(dev->sas_addr),
  678. scsi_dev->lun);
  679. scsi_dev->tagged_supported = 0;
  680. scsi_set_tag_type(scsi_dev, 0);
  681. scsi_deactivate_tcq(scsi_dev, 1);
  682. }
  683. scsi_dev->allow_restart = 1;
  684. return 0;
  685. }
  686. int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
  687. {
  688. struct domain_device *dev = sdev_to_domain_dev(sdev);
  689. if (dev_is_sata(dev))
  690. return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth,
  691. reason);
  692. switch (reason) {
  693. case SCSI_QDEPTH_DEFAULT:
  694. case SCSI_QDEPTH_RAMP_UP:
  695. if (!sdev->tagged_supported)
  696. depth = 1;
  697. scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  698. break;
  699. case SCSI_QDEPTH_QFULL:
  700. scsi_track_queue_full(sdev, depth);
  701. break;
  702. default:
  703. return -EOPNOTSUPP;
  704. }
  705. return depth;
  706. }
  707. int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
  708. {
  709. struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
  710. if (dev_is_sata(dev))
  711. return -EINVAL;
  712. if (!scsi_dev->tagged_supported)
  713. return 0;
  714. scsi_deactivate_tcq(scsi_dev, 1);
  715. scsi_set_tag_type(scsi_dev, qt);
  716. scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
  717. return qt;
  718. }
  719. int sas_bios_param(struct scsi_device *scsi_dev,
  720. struct block_device *bdev,
  721. sector_t capacity, int *hsc)
  722. {
  723. hsc[0] = 255;
  724. hsc[1] = 63;
  725. sector_div(capacity, 255*63);
  726. hsc[2] = capacity;
  727. return 0;
  728. }
  729. /* ---------- Task Collector Thread implementation ---------- */
  730. static void sas_queue(struct sas_ha_struct *sas_ha)
  731. {
  732. struct scsi_core *core = &sas_ha->core;
  733. unsigned long flags;
  734. LIST_HEAD(q);
  735. int can_queue;
  736. int res;
  737. struct sas_internal *i = to_sas_internal(core->shost->transportt);
  738. mutex_lock(&core->task_queue_flush);
  739. spin_lock_irqsave(&core->task_queue_lock, flags);
  740. while (!kthread_should_stop() &&
  741. !list_empty(&core->task_queue) &&
  742. !test_bit(SAS_HA_FROZEN, &sas_ha->state)) {
  743. can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
  744. if (can_queue >= 0) {
  745. can_queue = core->task_queue_size;
  746. list_splice_init(&core->task_queue, &q);
  747. } else {
  748. struct list_head *a, *n;
  749. can_queue = sas_ha->lldd_queue_size;
  750. list_for_each_safe(a, n, &core->task_queue) {
  751. list_move_tail(a, &q);
  752. if (--can_queue == 0)
  753. break;
  754. }
  755. can_queue = sas_ha->lldd_queue_size;
  756. }
  757. core->task_queue_size -= can_queue;
  758. spin_unlock_irqrestore(&core->task_queue_lock, flags);
  759. {
  760. struct sas_task *task = list_entry(q.next,
  761. struct sas_task,
  762. list);
  763. list_del_init(&q);
  764. res = i->dft->lldd_execute_task(task, can_queue,
  765. GFP_KERNEL);
  766. if (unlikely(res))
  767. __list_add(&q, task->list.prev, &task->list);
  768. }
  769. spin_lock_irqsave(&core->task_queue_lock, flags);
  770. if (res) {
  771. list_splice_init(&q, &core->task_queue); /*at head*/
  772. core->task_queue_size += can_queue;
  773. }
  774. }
  775. spin_unlock_irqrestore(&core->task_queue_lock, flags);
  776. mutex_unlock(&core->task_queue_flush);
  777. }
  778. /**
  779. * sas_queue_thread -- The Task Collector thread
  780. * @_sas_ha: pointer to struct sas_ha
  781. */
  782. static int sas_queue_thread(void *_sas_ha)
  783. {
  784. struct sas_ha_struct *sas_ha = _sas_ha;
  785. while (1) {
  786. set_current_state(TASK_INTERRUPTIBLE);
  787. schedule();
  788. sas_queue(sas_ha);
  789. if (kthread_should_stop())
  790. break;
  791. }
  792. return 0;
  793. }
  794. int sas_init_queue(struct sas_ha_struct *sas_ha)
  795. {
  796. struct scsi_core *core = &sas_ha->core;
  797. spin_lock_init(&core->task_queue_lock);
  798. mutex_init(&core->task_queue_flush);
  799. core->task_queue_size = 0;
  800. INIT_LIST_HEAD(&core->task_queue);
  801. core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
  802. "sas_queue_%d", core->shost->host_no);
  803. if (IS_ERR(core->queue_thread))
  804. return PTR_ERR(core->queue_thread);
  805. return 0;
  806. }
  807. void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
  808. {
  809. unsigned long flags;
  810. struct scsi_core *core = &sas_ha->core;
  811. struct sas_task *task, *n;
  812. kthread_stop(core->queue_thread);
  813. if (!list_empty(&core->task_queue))
  814. SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
  815. SAS_ADDR(sas_ha->sas_addr));
  816. spin_lock_irqsave(&core->task_queue_lock, flags);
  817. list_for_each_entry_safe(task, n, &core->task_queue, list) {
  818. struct scsi_cmnd *cmd = task->uldd_task;
  819. list_del_init(&task->list);
  820. ASSIGN_SAS_TASK(cmd, NULL);
  821. sas_free_task(task);
  822. cmd->result = DID_ABORT << 16;
  823. cmd->scsi_done(cmd);
  824. }
  825. spin_unlock_irqrestore(&core->task_queue_lock, flags);
  826. }
  827. /*
  828. * Tell an upper layer that it needs to initiate an abort for a given task.
  829. * This should only ever be called by an LLDD.
  830. */
  831. void sas_task_abort(struct sas_task *task)
  832. {
  833. struct scsi_cmnd *sc = task->uldd_task;
  834. /* Escape for libsas internal commands */
  835. if (!sc) {
  836. if (!del_timer(&task->timer))
  837. return;
  838. task->timer.function(task->timer.data);
  839. return;
  840. }
  841. if (dev_is_sata(task->dev)) {
  842. sas_ata_task_abort(task);
  843. } else {
  844. struct request_queue *q = sc->device->request_queue;
  845. unsigned long flags;
  846. spin_lock_irqsave(q->queue_lock, flags);
  847. blk_abort_request(sc->request);
  848. spin_unlock_irqrestore(q->queue_lock, flags);
  849. scsi_schedule_eh(sc->device->host);
  850. }
  851. }
  852. int sas_slave_alloc(struct scsi_device *scsi_dev)
  853. {
  854. struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
  855. if (dev_is_sata(dev))
  856. return ata_sas_port_init(dev->sata_dev.ap);
  857. return 0;
  858. }
  859. void sas_target_destroy(struct scsi_target *starget)
  860. {
  861. struct domain_device *found_dev = starget->hostdata;
  862. if (!found_dev)
  863. return;
  864. if (dev_is_sata(found_dev))
  865. ata_sas_port_destroy(found_dev->sata_dev.ap);
  866. starget->hostdata = NULL;
  867. sas_put_device(found_dev);
  868. }
  869. static void sas_parse_addr(u8 *sas_addr, const char *p)
  870. {
  871. int i;
  872. for (i = 0; i < SAS_ADDR_SIZE; i++) {
  873. u8 h, l;
  874. if (!*p)
  875. break;
  876. h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
  877. p++;
  878. l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
  879. p++;
  880. sas_addr[i] = (h<<4) | l;
  881. }
  882. }
  883. #define SAS_STRING_ADDR_SIZE 16
  884. int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
  885. {
  886. int res;
  887. const struct firmware *fw;
  888. res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
  889. if (res)
  890. return res;
  891. if (fw->size < SAS_STRING_ADDR_SIZE) {
  892. res = -ENODEV;
  893. goto out;
  894. }
  895. sas_parse_addr(addr, fw->data);
  896. out:
  897. release_firmware(fw);
  898. return res;
  899. }
  900. EXPORT_SYMBOL_GPL(sas_request_addr);
  901. EXPORT_SYMBOL_GPL(sas_queuecommand);
  902. EXPORT_SYMBOL_GPL(sas_target_alloc);
  903. EXPORT_SYMBOL_GPL(sas_slave_configure);
  904. EXPORT_SYMBOL_GPL(sas_change_queue_depth);
  905. EXPORT_SYMBOL_GPL(sas_change_queue_type);
  906. EXPORT_SYMBOL_GPL(sas_bios_param);
  907. EXPORT_SYMBOL_GPL(sas_task_abort);
  908. EXPORT_SYMBOL_GPL(sas_phy_reset);
  909. EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
  910. EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
  911. EXPORT_SYMBOL_GPL(sas_slave_alloc);
  912. EXPORT_SYMBOL_GPL(sas_target_destroy);
  913. EXPORT_SYMBOL_GPL(sas_ioctl);